Does CL matter here?
With the same money I can buy:
G.SKILL TRIDENTZ 64GB (4X16GB) DDR4 3200MHZ (F43200C14Q64GTZ)
or
G.SKILL TRIDENT Z RGB 64GB DDR4 (F43600C17Q64GTZR)
I'm going to run it on MSI MEG and only first one are on msi supported hw page so thinking about them.
Both denote the overall speed of memory, so when it comes to CL14 @3000 vs CL16 @3000, the former is better but won't make drastic difference on Threadripper.
With that said, you won't be able to run more than 3200Mhz @4x16GB capacity on 2990WX, it's simply not stable even with the latest AGESA update. Maybe in future, but not worth the time/risk and additional money on diminishing returns.
There isn't much to be gained after 2933.
Get the cheapest CL14-15 @2933(3000) memory you can get at 4x16GB capacity and instead either save your money or buy more memory.
So i think i'm at a point with my prospective spec i'm happy with.
Anyone seeing any issues or bottlenecks? Id maybe look at faster ram if the price wasn't too much of an increase.
64GB Corsair Vengeance 2666mhz RAM
Likewise, do get 2933MHz (3000), don't go lower ;- ).